Maya to blender,Change view selected component
The Problem is, that there is another Shortcut bound to F in that context, with a higher priority. In Blender there are context-bound shortcuts. You have changed the shortcut for the Object context. However, if you select a mesh and go into edit mode, you are in Mesh context.

In the Preferences, sort the shortcuts by Key-Binding and locate the Mesh section. Then remove or change the shortcut, which is currently bound to F, it will probably be Make Edge/Face. However, you will have to change the other shortcuts which are bound to F for each context individually.